Call for abstracts!
EGS - AGU - EUG Joint Assembly, Nice, France, April 2003
VGP3.22 Anelasticity of minerals and rocks: from dislocations and pore
fluids to planetary scale (sponsored by IMA-EMU)
Conveners:
Bagdassarov, N. ([log in to unmask]), Gueguen,
Y.([log in to unmask])
Character of seismic waves propagation and attenuation evidences that
the Earth is an anelastic planet. Some new observational facts of the
anelasticity in the Eath’s interior from crust to core provoke us for
an experimental and theoretical modelling of the processes involved. As
a matter of fact the nature of anelasticity of geomaterials stems from
numerous mechanisms acting in very differing length- and time-scale
including the migration of naturally occurred partial melts and pore
fluids, as well as the movement of dislocations and defects in
crystalline phases. High temperature background of internal friction Q
and relaxation of elastic moduli have been intensively explored over the
last decade in many laboratories. Problems of grain size scaling,
transient creep on grain boundaries, incorporating of hydrogen in
crystal structures, migration and reactivity of fluids in intergranular
space have been found effectively operating and affecting the anelastic
behaviour of polycrstalline rocks.
This session aims to elucidate all aspects of anelastic behaviour of
geomaterials in laboratory and in the Earth as a planet, and addresses
to rock and mineral physics community, seismologists, and geodynamic
modellers.
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